
public interface MyGL {
   public void glViewport(int x, int y);
   public void glLoadIdentity();
   public void glFrustum(double l, double r,
         double b, double t,
         double n, double f);
   public void glOrtho(double l, double r,
         double b, double t,
         double n, double f);
   public void glTranslate(double dx, double dy, double dz);   
   public void glScale(double sx, double sy, double sz); 
   public void glRotate(double angle, double x, double y, double z);
   public void glBegin();
   public void glEnd();
   public void glVertex(double x, double y, double z);   
   public void glPushMatrix();   
   public void glPopMatrix();
}
